Past theories of radiation swelling have mostly dealt with the effect of void growth on the steady-state rather than of void nucleation on the incubation of swelling. However, new analysis indicates that incubation and its dependence on dose rate, impurity concentrations. and temperature dramatically influences the cumulative experimental swelling. We present rate theory calculations of this void nucleation and growth that include the time-dependent coupling and evolution of point defect concentrations, void size distribution, and dislocation density. A transient, swelling-free period originates in the exponential sensitivity of nucleation to the temperature and point defect supersaturations and the dependence of the …
continued below
Publisher Info:
Lawrence Livermore National Lab., CA (United States)
Place of Publication:
California
Provided By
UNT Libraries Government Documents Department
Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.
Descriptive information to help identify this article.
Follow the links below to find similar items on the Digital Library.
Description
Past theories of radiation swelling have mostly dealt with the effect of void growth on the steady-state rather than of void nucleation on the incubation of swelling. However, new analysis indicates that incubation and its dependence on dose rate, impurity concentrations. and temperature dramatically influences the cumulative experimental swelling. We present rate theory calculations of this void nucleation and growth that include the time-dependent coupling and evolution of point defect concentrations, void size distribution, and dislocation density. A transient, swelling-free period originates in the exponential sensitivity of nucleation to the temperature and point defect supersaturations and the dependence of the defect concentrations on the dose rate, temperature, and aggregate sink strengths. Specifically. simulations representing cold worked pure metals show delayed swelling that is governed by dislocation evolution towards a reduced. steady-state density. Impurity atoms are expected to affect the incubation period through the initial dislocation density and subsequent rate of evolution. We conclude that appreciable void swelling requires a sufficiently low concentration of network dislocation and dislocation loop sinks, and that incubation is the time required to achieve this state.
This article is part of the following collection of related materials.
Office of Scientific & Technical Information Technical Reports
Reports, articles and other documents harvested from the Office of Scientific and Technical Information.
Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.